The correct answer is D. SCSI.
SCSI (Small Computer System Interface) is a standard interface for connecting peripheral devices to a computer. It is a high-speed, parallel interface that can support multiple devices. SCSI is the most common interface for connecting CD-ROM drives to computers.
ESDI (Enhanced Small Device Interface) is a parallel interface that was developed in the early 1980s. It was a popular interface for hard drives and other storage devices. However, it is not capable of supporting CD-ROM drives.
ARLL (Advanced Run Length Limited) is a technique that was developed to improve the performance of IDE (Integrated Drive Electronics) drives. It is not a separate interface, but rather a feature of IDE drives. ARLL is not capable of supporting CD-ROM drives.
MFM (Modified Frequency Modulation) is a technique that was developed to improve the performance of floppy disk drives. It is not a separate interface, but rather a feature of floppy disk drives. MFM is not capable of supporting CD-ROM drives.
Therefore, the only interface that can support an external CD-ROM drive is SCSI.